To fix issues with your VMware ESXi license key or to apply a new one, you can follow these steps based on whether you are managing a standalone host or using vCenter Server. Applying a License Key to an ESXi Host
Understanding VMware ESXi License Keys
If you need a fixed key today, your only legal option is the Free ESXi license from Broadcom or using an existing perpetual license from before the 2024 licensing change. vmware esxi license key fixed